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 ###Instrução: Qual é a classificação mais baixa para Porto Rico?
 ###Tabelas: CREATE TABLE top_15_countries_by_tally (top_15_countries_by_tally_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Country VARCHAR, Miss Universe INT, 1st Runner-up INT, 2nd Runner-up INT, 3rd Runner-up INT, 4th Runner-up INT, Semifinalists INT, Total INT) CREATE TABLE legislation_sponsored_by_john_mccain (legislation_sponsored_by_john_mccain_id AUTO_INCREMENT PRIMARY KEY, Years covered VARCHAR, All bills sponsored INT, All amendments sponsored INT, All bills cosponsored INT, All amendments cosponsored INT, Bills originally cosponsored INT, Amendments originally cosponsored INT) CREATE TABLE diagnosis (diagnosis_id AUTO_INCREMENT PRIMARY KEY, Condition VARCHAR, Prothrombin time VARCHAR, Partial thromboplastin time VARCHAR, Bleeding time VARCHAR, Platelet count VARCHAR) CREATE TABLE list_of_rmsp_company_vessels (list_of_rmsp_company_vessels_id AUTO_INCREMENT PRIMARY KEY, Ship VARCHAR, Date Commissioned INT, Gross Tonnage INT, Propulsion VARCHAR, Material VARCHAR) CREATE TABLE innings_or_series (innings_or_series_id AUTO_INCREMENT PRIMARY KEY, Runs VARCHAR, Player VARCHAR, Opponent VARCHAR, Venue VARCHAR, Season VARCHAR)  
SELECT MIN Rank FROM top_15_countries_by_tally WHERE Country = Puerto Rico